include/uapi/linux/can/gw.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/can/gw.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/can/gw.h
Extension
.h
Size
8036 bytes
Lines
223
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rtcanmsg {
	__u8  can_family;
	__u8  gwtype;
	__u16 flags;
};

/* CAN gateway types */
enum {
	CGW_TYPE_UNSPEC,
	CGW_TYPE_CAN_CAN,	/* CAN->CAN routing */
	__CGW_TYPE_MAX
};

#define CGW_TYPE_MAX (__CGW_TYPE_MAX - 1)

/* CAN rtnetlink attribute definitions */
enum {
	CGW_UNSPEC,
	CGW_MOD_AND,	/* CAN frame modification binary AND */
	CGW_MOD_OR,	/* CAN frame modification binary OR */
	CGW_MOD_XOR,	/* CAN frame modification binary XOR */
	CGW_MOD_SET,	/* CAN frame modification set alternate values */
	CGW_CS_XOR,	/* set data[] XOR checksum into data[index] */
	CGW_CS_CRC8,	/* set data[] CRC8 checksum into data[index] */
	CGW_HANDLED,	/* number of handled CAN frames */
	CGW_DROPPED,	/* number of dropped CAN frames */
	CGW_SRC_IF,	/* ifindex of source network interface */
	CGW_DST_IF,	/* ifindex of destination network interface */
	CGW_FILTER,	/* specify struct can_filter on source CAN device */
	CGW_DELETED,	/* number of deleted CAN frames (see max_hops param) */
	CGW_LIM_HOPS,	/* limit the number of hops of this specific rule */
	CGW_MOD_UID,	/* user defined identifier for modification updates */
	CGW_FDMOD_AND,	/* CAN FD frame modification binary AND */
	CGW_FDMOD_OR,	/* CAN FD frame modification binary OR */
	CGW_FDMOD_XOR,	/* CAN FD frame modification binary XOR */
	CGW_FDMOD_SET,	/* CAN FD frame modification set alternate values */
	__CGW_MAX
};

#define CGW_MAX (__CGW_MAX - 1)

#define CGW_FLAGS_CAN_ECHO 0x01
#define CGW_FLAGS_CAN_SRC_TSTAMP 0x02
#define CGW_FLAGS_CAN_IIF_TX_OK 0x04
#define CGW_FLAGS_CAN_FD 0x08

#define CGW_MOD_FUNCS 4 /* AND OR XOR SET */

/* CAN frame elements that are affected by curr. 3 CAN frame modifications */
#define CGW_MOD_ID	0x01
#define CGW_MOD_DLC	0x02		/* Classical CAN data length code */
#define CGW_MOD_LEN	CGW_MOD_DLC	/* CAN FD (plain) data length */
#define CGW_MOD_DATA	0x04
#define CGW_MOD_FLAGS	0x08		/* CAN FD flags */

#define CGW_FRAME_MODS 4 /* ID DLC/LEN DATA FLAGS */

#define MAX_MODFUNCTIONS (CGW_MOD_FUNCS * CGW_FRAME_MODS)

struct cgw_frame_mod {
	struct can_frame cf;
	__u8 modtype;
} __attribute__((packed));

struct cgw_fdframe_mod {
	struct canfd_frame cf;
	__u8 modtype;
} __attribute__((packed));

#define CGW_MODATTR_LEN sizeof(struct cgw_frame_mod)
#define CGW_FDMODATTR_LEN sizeof(struct cgw_fdframe_mod)

struct cgw_csum_xor {
	__s8 from_idx;
	__s8 to_idx;
	__s8 result_idx;
	__u8 init_xor_val;
} __attribute__((packed));

struct cgw_csum_crc8 {
	__s8 from_idx;
	__s8 to_idx;
	__s8 result_idx;
	__u8 init_crc_val;
	__u8 final_xor_val;
	__u8 crctab[256];
	__u8 profile;
	__u8 profile_data[20];
} __attribute__((packed));

Annotation

Implementation Notes